General Information | Krell Industries KSA 150 / 250 specification

A.GENERAL INFORMATION

The latest generation of high-resolution source components and speakers places new demands on the power amplifier. The Krell KSA 150 and KSA-250 meet these challenges with fresh design sophistication and long-term value. Both products can drive any speaker with an effortless quality that makes their power seem endless. Extreme clarity is maintained at all power levels. They both utilize Krell refined high-bias Class A and direct-coupled circuitry from input to output. Their power supplies and output stages are massive. High voltage rails with extensive regulation are provided for the input circuitry. All materials and electronic components are of the finest quality and operate within their optimum performance ranges. Virtually all hand wiring has been eliminated, resulting in a dramatic improvement in sonic clarity.

The KSA-150 and KSA-250 both utilize Class A circuitry throughout the audio and power supply regulation stages. Class A gain stages deliver excellent sonic performance under diverse conditions because all active components are turned on at all times. This allows each component to operate in its most linear and precise regions. The amplifiers are able to respond to the full range of input signals with equal accuracy.

The KSA-150 and the KSA-250 are conservatively rated at 150 and 250 watts per channel into 8 ohms, respectively. The 150 will actually generate 220 watts into 8 ohms, and the 250 will generate 320 watts into 8 ohms. The 8-ohm power ratings do not account for the amplifiers superb sonic performance nor describe their maximum power. The Krell definition of power and the ability to drive low impedances is that the output must double into successively low impedances. The immense power supplies in both products allow them to double their power into one ohm.

There are many advances in thermal construction and control circuitry in the KSA -150 and KSA -250. All heat bearing structural components and external heat sinks have been designed in-house to improve thermal tracking and cooling. This construction provides very low thermal resistance between the output transistors and the heat sinks, resulting in superior thermal tracking. It also results in a considerable reduction in overall size. Greater amplifier life expectancy is an added design benefit.

Automatic self-adjusting bias and DC offset control circuitry have been developed for the KSA-150 and the KSA-250. These circuits compel the amplifiers to conform to their intended operational parameters under all AC mains conditions. A variation of approximately 10% in the AC can generally be accommodated, guaranteeing consistent performance in all environments.

The KSA-150 and KSA-250 are protected by a series of opto-coupled, non- intrusive circuits that constantly evaluate the amplifiers operation. Appropriate

KSA 150 / 250 specifications

Krell Industries has long been a leader in high-end audio equipment, and their KSA 150 and KSA 250 amplifiers exemplify this commitment to excellence. Both models are celebrated for their exceptional performance, build quality, and innovative technologies, aimed at delivering pure, accurate sound reproduction.

The KSA 150 and KSA 250 feature a unique class A design, which is fundamental to their sonic performance. Class A amplification is known for its low distortion and high linearity, allowing these amplifiers to deliver a clear and dynamic audio experience. The KSA 150 provides an output power of 150 watts per channel into 8 ohms, while the KSA 250 ups the ante with 250 watts per channel into 8 ohms, making them suitable for even the most demanding speakers.

One of the standout characteristics of these amplifiers is the robust power supply and large transformer design. The dedicated power supply ensures ample current delivery, which is crucial for maintaining control over the speaker drivers and providing the energetic dynamic range that listeners appreciate. Krell's proprietary circuitry design further enhances performance by minimizing feedback and ensuring that the amplifier maintains its integrity even at high output levels.

Both models incorporate advanced thermal management technology. With their large heat sinks and efficient cooling systems, the KSA 150 and KSA 250 can dissipate heat effectively, allowing for continuous operation without risk of overheating. This engineering not only prolongs the life of the components but also ensures consistent performance during extended listening sessions.

Another feature of the KSA series is the balanced and unbalanced input options, providing flexibility for various audio setups and ensuring compatibility with a wide range of source components. This adaptability is crucial for audiophiles who often shuffle equipment to achieve the best sound.

In terms of aesthetics, the Krell KSA amplifiers are designed with a modern yet classic appearance that complements high-end audio systems. The sturdy chassis and premium finishes reflect the attention to detail and craftsmanship synonymous with the Krell brand.

Overall, the Krell KSA 150 and KSA 250 amplifiers represent the pinnacle of audio engineering, making them a perfect choice for enthusiasts seeking top-tier sound quality and performance. Whether for home theater or high-fidelity listening, these amplifiers deliver an unparalleled audio experience that continues to impress both critics and consumers alike.